Richard Clark wrote:
On Mon, 17 Mar 2008 09:17:01 -0700, Jim Lux
wrote:


run through a variable combiner


Hi Jim,

As Richard pointed out, a goniometer (what, a 100 years old already?)
works fine for this.

A potential problem with a goniometers is that they aren't particularly
broadband, although, I suppose that if the relative coupling ratios
change with frequency, at least they're consistent.

The example cited below is an example of this. You adjust for best
null/peak on your desired signal, which is narrow band. The setting for
one frequency isn't likely to be the same as the setting for another
frequency.

In an application where you want to combine multiple skywave paths, one
probably wants something that can be automatically adjusted.



I bought one at a Ham swap when I was a
teenager. I also pointed this goniometer/antenna application out to
Arthur to demonstrate what he thought was novel was quite old (in
reference to the work of Tosi and Bellini). Arthur does not
acknowledge prior inventors, so this topic consistently re-emerges
with a fair periodicity. It should reappear around July again.

For those who want to see a schematic of the goniometer and antenna
application, here is a perfectly good example:
http://www.elektronikschule.de/~krau...ng%20-%205.htm

73's
Richard Clark, KB7QHC